CVE-2026-89554

A flaw was found in the Linux kernel's Multipath TCP MPTCP implementation. When reconstructing a Multipath TCP MPTCP join request under SYN cookies, the localid field is not properly initialized. An off-path attacker can influence this uninitialized field by sending concurrent MPJOIN SYN requests...

CVE-2026-89554

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix uninitialized localid in syncookie MPJOIN reconstruction mptcptokenjoincookieinitstate restores remotenonce, localnonce, backup, joinid, token and msk from the saved cookie entry when rebuilding the request socket for ...

CVE-2026-89554

Linux kernel MPTCP is affected by an uninitialized memory bug in the SYN cookie MP_JOIN reconstruction path. When rebuilding a request socket for a 4th-ACK MP_JOIN handled under SYN cookies, mptcp_token_join_cookie_init_state() restores several fields but fails to restore local_id. Since the requ...

CVE-2026-89554 mptcp: fix uninitialized local_id in syncookie MP_JOIN reconstruction

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix uninitialized localid in syncookie MPJOIN reconstruction mptcptokenjoincookieinitstate restores remotenonce, localnonce, backup, joinid, token and msk from the saved cookie entry when rebuilding the request socket for ...

EUVD-2026-76465

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix uninitialized localid in syncookie MPJOIN reconstruction mptcptokenjoincookieinitstate restores remotenonce, localnonce, backup, joinid, token and msk from the saved cookie entry when rebuilding the request socket for ...